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Timing chains installation test

Discussion in '2nd Gen. Tacomas (2005-2015)' started by foampile, Dec 14, 2021.

  1. Dec 14, 2021 at 8:52 AM
    #1
    foampile

    foampile [OP] Well-Known Member

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    Other than following the instructions from the manual WHILE DOING IT, is there a method to test the timing chains installation AFTER THE FACT? Like you delegated the task to an employee and now you have to come see he did it right.

    When installing the camshafts, one design flaw that inhibited testing, as I observed, was that, while the dot market on the exhaust camshafts was still visible, the view to the one on the intake side was blocked on the front by the VVT phaser drum and in the back by the first (largest) bearing. So, to verify that whoever did it did it right, you need another testing method, which I am sure must exist.

    I understand the generic advice "do it right when doing it" (or some variation thereof) but being able to test any technical product before committing to the stage where mistakes are costly is an integral part of any quality product lifecycle.
     
    Last edited: Dec 14, 2021
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  2. Dec 14, 2021 at 7:21 PM
    #2
    Dm93

    Dm93 Test Don't Guess

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    The only other 2 "verification" methods of timing aside from timing mark alignment would be a cam/crank sensor waveform scope capture compared to a known good or in cylinder pressure waveform both would require the engine to be cranking or running.
    If you put the colored links in the correct positions when you assembled it there's really no way for it to get out of time without jumping teeth.
     
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  3. Dec 14, 2021 at 8:50 PM
    #3
    foampile

    foampile [OP] Well-Known Member

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    Crank:

    20211214_201935.jpg

    Right:

    20211214_201955.jpg

    Left:

    20211214_202017.jpg
     
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  4. Dec 14, 2021 at 9:31 PM
    #4
    b_r_o

    b_r_o Gnar doggy

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    Is there some pids you could see on a scan tool that would show correlation? I've used that on VW/audi.. not sure about toyota

    Other than that or a scope capture all I can think of is just driving it and hoping it doesn't code

    All you have is visual /mechanical reference until everything is reassembled and running
     
    Last edited: Dec 14, 2021
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  5. Dec 14, 2021 at 9:35 PM
    #5
    tcjacado

    tcjacado Well-Known Member

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  6. Dec 14, 2021 at 9:51 PM
    #6
    TnShooter

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  7. Dec 14, 2021 at 9:56 PM
    #7
    TnShooter

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    FWIW, you don’t show the crank key correlation to the block timing line.
    But your picture looks about right for where the dot should be.
     
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  8. Dec 14, 2021 at 10:11 PM
    #8
    Bishop84

    Bishop84 Well-Known Member

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    It's good, can't confirm the secondary marks.

    As a back up I always want to see TDC on cylinder #1 to have both valves equally closed. So cam lobes opposed.

    I'm doing a tundra chain right now, I'll snap a pic tomorrow.
     
  9. Dec 15, 2021 at 12:46 AM
    #9
    Empty_Lord

    Empty_Lord Toyotaholic

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    Looks fine off what I remember on the 1GR
     
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  10. Dec 15, 2021 at 4:29 AM
    #10
    avery0829

    avery0829 Well-Known Member

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    From what I recall, it takes like 6-8 full revolutions of the chain to have the color coded links and crank match up.

    When I put everything back together I rotated it to make double sure.
     
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  11. Dec 15, 2021 at 8:31 AM
    #11
    foampile

    foampile [OP] Well-Known Member

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    Correct. After the original alignment of the three marked links on the chain and the notches/dots on the crank and cam sprockets, it takes something like what you said (maybe 7) full revolutions of the no. 1 (big) chain (so not just of the crank) to get the same alignment again.
     
  12. Dec 15, 2021 at 10:04 AM
    #12
    Dm93

    Dm93 Test Don't Guess

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    If your marks all line up and you installed/torqued everything properly you should be good to go.
     
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  13. Dec 15, 2021 at 10:08 AM
    #13
    foampile

    foampile [OP] Well-Known Member

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    I get that and they are indeed -- I was just wondering about other testing methods.

    Like, for example, since 1GR-FE is an interference engine, would a mistake in timing necessarily always result in an interference, which could be timely and cheaply detected by a stall when turning the crankshaft, i.e. much before firing up the engine? Or is there a scenario where that does not happen but the timing is still wrong?
     
  14. Dec 15, 2021 at 10:14 AM
    #14
    Dm93

    Dm93 Test Don't Guess

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    You would have to be quite a few teeth out of time before interference would occur but you would feel it get tight barring the engine over by hand with the plugs removed if something was hitting.
     
  15. Dec 15, 2021 at 10:22 AM
    #15
    nd4spdbh

    nd4spdbh Well-Known Member

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    it can take MANY more turns than that to get colored markings to line up on all 3 chains. Colored markings should only be used as a reference, the end all is the mark on the crank to block then marks on cam gears to head.
     
  16. Dec 17, 2021 at 4:23 AM
    #16
    6 gearT444E

    6 gearT444E Certified Electron Pusher

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    Are you putting an engine back together by asking each step on a new thread @foampile ? I see lots of separate threads where it seems you are lacking the knowledge and maybe better off taking to a mechanic.
     
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  17. Dec 17, 2021 at 6:01 AM
    #17
    TnShooter

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  18. Dec 17, 2021 at 6:13 AM
    #18
    AllTacosFloat

    AllTacosFloat If yours sank you’re entitled to compensation

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    Should have just kept one thread going. Could have maybe been an informative timing chain and cam shaft replacement thread.

    Need a general "ask a pro" sticky for each gen.?
     
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  19. Dec 17, 2021 at 6:20 AM
    #19
    TnShooter

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    Those “ask a Pro” threads never work out. 90% of the time you’ll get advice from guys that aren’t pro’s.

    50% of the answer is not even relative to the question.

    And No, I’m not a Pro. :rofl:
     
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  20. Dec 17, 2021 at 6:24 AM
    #20
    6 gearT444E

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    I agree, I see 3 or 4 threads on what appear to be the same topic and I gave up on answering the smattering of questions that could be combined in one thread.
     

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